The carbon graphite ring is made from graphite. If you add some stainless steel bushing, the carbon graphite ring can be pressed into forms. This kind of graphite products feature in high temperatures endurance, corrosion, anti-aging, supple and springy. And it is also with anti-corrosion capability, self-lubricant capability, a high conductivity coefficient, a small coefficient of expansion and a low friction coefficient. As a result of those advantages, it is suitable for mechanic seal.
We use seal device to seal gases or liquids in the closed windows. The moving parts (shaft of piston rod) can protrude from the closed windows through seal devices so as to connect with the prime movers. While carbon graphite ring seals can be made into non-contact structure. We can leave small gap between the fixed and moving parts, or the contact structure with the fixed and moving parts contacting each other.